Missing Plug-ins
The Plug-in could not be found message appears in the following situations:
When you remove an external device from the Audio Connections window although it is used in a saved project.
When you transfer a project to another computer on which the external device is not defined.
When you open a project that is created with an earlier version of Cubase.
In the Audio Connections window, the broken connection to the external device is indicated by an icon in the Bus Name column.
To reestablish the broken connection to the external device, right-click the entry for the device in the Bus Name column and select Connect External Effect.
Busses that are set up for external instruments or external effects are saved globally, that is, for your particular computer setup.